**G43 — Migraine** is a recurrent neurological disorder characterized by headache attacks lasting 4-72 hours, often with associated symptoms (nausea, photophobia, phonophobia).
Sub-codes distinguish: G43.0 (without aura), G43.1 (with aura), G43.7 (chronic migraine, ≥15 days/month). Ophthalmoplegic and basilar variants have their own sub-codes.
Belongs to **Chapter G** — Diseases of the nervous system (G00-G99).
